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1The present investigation represented an attempt to validate the Poetzl dream experiment and the Allers and Teler imagery experiment, i.e., to demonstrate the effect of subliminal visual stimulation on subsequent dreams and images. The methodological deficiences of previous research were corrected by instituting experimental controls and checks at as many points in the procedure as possible: from the point where the stimulus is subliminally exposed to the subject to the point where the drawings depicting his imagery are evaluated.
2The following major innovations were made in the experimental design: (1) a control session in which the subject provided samples of his spontaneous imagery following no subliminal exposure; (2) more than one recovery condition, namely, the upright-light and the supine-dark; (3) a checklist, based upon an objective description of the stimulus (double-profile) for scoring and evaluating the data; (4) the scoring of the data by "blind" judges who did not know the nature of the experiment; (5) the use of a second subliminal stimulus (clock) that differed substantially from the first in both its figural and conceptual properties; (6) a statistical evaluation of the results.